| article html file updated | 7 February 2020 06:28 CET | Update | https://www.mdpi.com/1996-1073/9/4/241 |
| article html file updated | 5 May 2019 20:18 CEST | Update | - |
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| article html file updated | 28 April 2016 07:49 CEST | Update | - |
| article html file updated | 26 March 2016 13:21 CET | Original file | - |
| article xml uploaded. | 26 March 2016 13:19 CET | Original file | https://www.mdpi.com/1996-1073/9/4/241/xml |
| article pdf uploaded. | 26 March 2016 13:19 CET | Version of Record | https://www.mdpi.com/1996-1073/9/4/241/pdf |
